/*
 * The MIT License
 * 
 * Copyright (c) 2008 Michal Gron (michal.gron@gmail.com)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package sk.prasa.webapis.picasa.core.command 
{
import sk.prasa.webapis.picasa.core.receiver.IReceiver;
import sk.prasa.webapis.picasa.objects.UrlParams;

import flash.events.Event;
import flash.net.URLLoader;
import flash.net.URLRequest;
/**
 * Loads the feed, adds event handlers to the receiver. 
 * Part of the Command Pattern
 * 
 * @private
 */
public class GetFeedCommand implements ICommand
{
	private var receiver : IReceiver;
	private var params : UrlParams;
	
	/**
	 * Command constructor.
	 * 
	 * @param r IReceiver A IReceiver instance.
	 * @param p UrlParams Parameters to alter the feed url.
	 */
	public function GetFeedCommand(r : IReceiver, p : UrlParams)
	{
		receiver = r;
		params = p;
	}

	/**
	 * Executes the command.
	 * 
	 * @throws Error, generic.
	 */
	public function execute() : void
	{
		var tRequest : URLRequest = params.url_request;

		trace("(" + tRequest.method + ") " + tRequest.url);
		
		// Other events are handled by the PicasaResponder directly.
		var tLoader : URLLoader = receiver.responder;
			tLoader.addEventListener(Event.COMPLETE, receiver.result);
		
		try
		{
			tLoader.load(tRequest);
		}
		catch(e : Error)
		{
			throw new Error("Loading feed failed. Reasong: " + e.message);
		}
	}		
}
}